Adding-machine



(ModeL) J. G. FISCHER.

ADDING MACHINE.

No. 255,270. Patented Mar. 21,1882.

INVENTOR V w AJ MM ATTORNEYS.

UNITED STATES PATENT OFFICE.

JOHN GEORGE FISCHER, OF FLEMINGSBURG, KENTUCKY.

ADDiNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 255,270, dated March 21, 1882.

Application filed August 25, 1881. (ModelJ To all whom it may concern:

Be it known that 1, JOHN G. FISCHER, ot' Flemingsburg, in the county of Fleming and State of Kentucky, have invented a new and Improved Adding-lvlaehine, of which the fol lowing is a specification.

The invention consists in an adding-machine formed of certain essential parts, which will first be described in connection with the drawings, and then pointed out in the claims.

Figure l is an enlarged plan of the improved adder. Fig. 2 is an enlarged plan of the same with the cover removed to exhibit the interior mechanism. Fig. 3 isan enlarged crossseetion of the same on line at 00, Fig. 2. Fig. 4 is an enlarged plan of the reverse of the units wheel and disk and connected mechanism. Fig. 5 is an enlarged plan ofthe tens wheel and disk. Fig. 6 is an enlarged plan of the segmental rack.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents the ease, preferahlycylindrieal, and containing several posts a, for the convenient attachment of the easecover B. The bottom 0 of the case has holes I) 1) formed in it for the reception of the lower ends of the several disk and wheel pivots, and over this bottom 0 is secured, by screws 0 or other suitable device, a l'alse bottom, 0, to prevent the escape of oil from the pivot-bearings I) b, so that said machine may be handled without soiling the fingers of the operator.

D represents the hundreds-disk, and D the hundreds-wheel, rigidly secured the one above the other, so as to revolveinhorizontal planes on a barrel, d, which is set over and upon the pivot-pinf, that projects upward from the bottom 0. Said disk D has arranged in the usual order on its face the numbers from 0 to 9, in elusive.

E represents the tens-disk, and E the tenswheel, rigidly secured one above the other, so as to revolve in horizontal planes on a barrel, 9, which is set over and upon a pivot-pin, h, that projects upward from the bottom 0. Said disk E has arranged on its face in the usual order the numbers from 0 to 9, inclusive, and said wheel E has a pin, i projecting downward from apoint corresponding with one midway between the figures 0 and 1 on the disk E,

and said wheel E being at a higher elevation than the wheel D, the said pin i will engage between the teeth of the wheel D.

F represents the units-disk, and F the unitswheel, rigidly secured one above the other on a pivot-pin, k, whose point is entered into the bottom 0. Said disk F has'arranged 011 its face in the usual order the numbers from 0 to 9, inclusive, and said wheel F has a downwardprojecting pin, Z, for engaging between the teeth of thewheel E. Loosely set on said pivot k, beneath the wheel F, is a pinion, G, and attached ratchet-wheel G, whose functions will be hereinafter set forth, and on the under sideot' wheel F is pivoted a dog, at, that by a spring, m, also secured on the under side of wheel F, is made to engage with the ratchet-wheel G, so that the pivot k and the parts supported by it shall turn or rotate in unison with the pinion G.

On an upright pivot, n, that projects centrally up from the case-bottom O, are rigidly secured, one abovethe other, a segmental rack, H, and a periphorally-grooved sheave, H, the former of which is designed to engage in the pinion G, while to the latter is secured one end of a chain, I, whose other extremity is made fast to a spring, 1, whereby said rack H is brought back toitsprimary position afterevery movement therefrom.

On vertical posts ooo' that project upward from the ease-bottom U,dogs KKK", respectively, are held by pins 1) in such position that said dogs K K K can operate on the wheels D E F, respectively, to hold said wheels in position, and said dogs K K K are respectively made to engage with the wheels D E F by springs L L L that are secured on the inside of the case A.

The cover B, which is secured on the case A by screws 3 s, or other convenient devices, has projecting up through it the barrels d g and pivots 7.: n, on the latter of which is fixed the finger or pointer M, that may be turned to point to any of the figures shown at t on the said cover B. The normal position of said finger or pointer M is as shown in Fig. 1, and it is limited in its movements in one direction by the contact of the rack H with a stop, 11, that projects upward from the bottom C, and in the other direction by the eontactot' the rack H with a stop, to, that is fixed in the bottom 0.

In the cover 13, directly over the disks D E F, respectively, are apertures 3 through which the numbers on said disks D E F may be read.

In operating the device a key is first applied to the barrels d g and pivot 70, and the disks D E F turned so that they all present ciphers at the respective apertures 3 3 the units-disk F is turned to the left, the tens-disk E to the right, and the hundreds-disk F in either direction. It is desired, for example, to add the following sums or columns of figures, c.-

The operator, taking hold of the pointer M, moves it to the figure 2 on the cover 13, whereby the rack H is made to rotate the wheel and disk F F the distance of two wheel-teeth, and the figure 2 on the disk F appears at the corresponding aperture, y, and then, releasing said pointer M, it is carried back to 0 on the left of the line of figures by the action of the chain and spring I I. Then moving the pointer M to the figure 9 on the cover B, the wheel and disk F F are rotated so that the figure 1 appears at the aperture 3 over the disk F, and figure 1 appears also at the aperture 3 over the disk E, thus showing the number 11, for as the Wheel and disk F F have completed one revolution and are rotated farther the pin l engages against a tooth of the wheel E and moves said wheel E the distance of onetooth, which is indicated by the disk E presenting the figure 1 at its aperture 3 The pointer M is then permitted to return to 0, and then moved to 3, whereby the disk and wheel FF are fun ther rotated, so that the former presents the figure 4, so that the reading from the disks E F is 14. The pointer M is then returned to 0, and then moved to the figure 8, whereby the disks E F are both made to present the figure 2 at their apertures y y. The number 22 is then set down, as shown above, and the disks E F are rotated by the use of a key, as set forth, until they present ciphers at their respective apertures 3 y. The next column ot' figures and then the next are added in like manner, and their results set down, as shown above; or, in adding the above columns of figures, the units-figure 2 may be set down and thetens-figure 2 be carried over and counted with the next column.

As many columns as may be desired, provided the sum ofeaeh one does not exceed one thousand, may be added by this device, and the work be done with great rapidity and correctness.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- An adding-machine constructed substantially as herein shown and described, consisting of pivoted disks and wheels D E F D 11 F, respectively, case A, provided with numbered and perforated cover B, pivoted pointer and rack M H, respectively, pinion G, ratchet-wheel G, and spring-actuated dogs, arranged as set forth.

JOHN GEORGE FISCHER.

Witnesses:

HARRY ANDREWS, JNo. W. HEFLIN. 

